Fix for dry pluging not being able to parse files generated on Windows system due to encoding issue

pmd-cpd generates files that have the Cp1252 encoding on Windows system and due to a bug it could not be changed to utf-8. These files were not accepted by the parser. Changing the encoding to UTF-8 in the parser will do the job.
See pmd bug: https://sourceforge.net/p/pmd/bugs/1144/
See also: https://issues.jenkins-ci.org/browse/JENKINS-15593?focusedCommentId=188706&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-188706